John Graham wrote:

> Can anyone tell me what the little round test plug with a rubber cap
> on it
> attached to the back side of my alternator is for?  When you pear
> inside
> the plug, there is a male fitting with 3 small pins.  I asked the VW
> service advisor about it when I was there last week and he didn't have
> a
> clue.
>
> John Graham
> 88 Westy
> Charlotte NC

   If it is the same as mine you will see that the wire goes to a sensor
to detect timing off or the flywheel. Probably used for computerized
diagnostics.
Mark
'84 GL
'81 Westy
etc....